Stop-watch.



v. NIVOIS.

STOP WATCH. APPLIUATION FILED NOV. 21, 1910.

1,1 1 6,836. Patented Nov. 10, 1914,

4 WIT/VESS'ES INVE/VTUI? TH f-I NORRIS PETERS 60.. PHbTaLlTh X.WASHINGTON. D. c

UNITED STATES PATENT OFFICE.

VICTOR NIVOIS, OF NEW YORK, N. Y.

STOP-WATCH.

To all whom it may concern:

Be it known that I, VICTOR Nrvois, a citizen of the United States, andresident of the borough of Brooklyn, county of Kings, city and State ofNew York, have invented certain new and useful Improvements inStop-Watches, of which the following is a specification.

My invention relates to stop watches, and particularly to stop watchesof the character of that disclosed in Petrillos United States Patent No.755,313 of March 22, 1904. In watches of this type, the timing hand orso-called split second hand is connected with a driven wheel and with aheart cam; this wheel is adapted to be engaged at times by a drivingwheel carried by a shipper arm, while the heart-cam is adapted to beengaged by a fly-back arm to bring the hand back to the initialposition. An operating member (moved through the medium of a push-buttonor the like) controls the position of both arms in such a manner thatthe first actuation of said member will bring the two wheels in mesh andthus start the timing hand; the next movement of the operating memberwill stop the hand wherever it happens to be, and a third movement ofthe operating member will cause the hand to fly back to its initialposition.

The object of my invention is to obtain a very compact and efficientarrangement of parts in a stop watch of the general type indicatedabove, so that a strong, durable and accurately operating constructionmay be produced at a comparatively low cost.

To this end, my invention consists in certain novel features describedand claimed hereinafter.

Reference is to be had to the accompanying drawings, in which- Figure 1is a face view of the improved mechanism; Fig. 2 is a section on line 22of Fig. 1, Figs. 3 and i are detail face views of the setting device forcontrolling the mechanism, and Fig. 5 is a cross section of said device.

In its general features, the stop mechanism is or may be the same as inthe Petrillo patent above referred to. I shall therefore give only abrief description of those parts which have been (or may be) leftunaltered. The split second hand A is secured rigidly to a shaft A whichalso carries rigidly the driven wheel A and the heart cam A The latteris adapted to Specification of Letters Patent.

Application filed November 2-1, 1910.

Patented Nov. 10, 1914.

Serial No. 593,383.

be engaged by the inner end of the fly-back arm B pivoted at B by meansof a stud entering a socket of the watch plate and pressed toward thecam by a spring C fitted against a shelf B on said arm. The spring alsopresses the fly-back arm toward the rotary actuating member D which is astar-wheel secured to a shaft D. To this shaft is also secured rigidly aratchet-wheel D held against turning in one direction by a retainingpawl E, and advanced step by step in the other direction by a pin Fprojected from an arm F which is guided by a pin G and normally pressedoutward by a spring H. A push pin I, engaged by the usual winding arborI, is adapted to move the arm F and pin F inward when the ordinarywinding and setting button (not shown) connected with said arbor ispressed, in the manner customary for the operation of stop-watches. Thepin G or the winding pinion I forms a stop to limit the outward movementof the arm F (Fig. 3) while when pressed inward, the arm F turnsslightly on its guide pin so as to allow the pin F to reach the positionshown in Fig. 4. The ratchet wheel D has three times as many teeth asthe actuating starwheel D, so that three operations of the push pin Iwill be required to bring the projection B of the fly-back arm B back toits initial position shown in Fig. 1. This is in accordance with thewellknown principle of operating stop-watches of the character hereinreferred to.

My invention relates particularly to the arrangement of the partsconnected with the shipper-arm J. One end of this arm is pivoted at J,the other end engages the actuating member or star-wheel D. Theintermediate portion is preferably curved to conform more or less to theperiphery of the driven wheel A and carries, adjacent thereto, thedriving wheel K, to which motion is imparted in any suitable manner; forinstance, the shaft K of said wheel may be journaled in the frame insuch a way as to be capable of a slight rocking motion also, suflicientto bring the wheels A and K into and out of engagement, while leavingthe driving train K L in permanent mesh. Between the driving wheel K andthe pivot J, the shipper arm J is formed with a bend J engaged by therounded end M of a spring M secured to the watch frame at M Preferably astop pin N is arranged to be engaged by the shipper arm J between thedriven wheel K and the point engaged by the spring M, to limit themovement of said arm in the direction in which the spring presses it. Avery compact, strong, durable and efiicient arrangement is thus obtained at a low cost of manufacture.

Various modifications may be made with out departing from the nature ofmy invention as defined in the appended claim.

I claim:

In a stop-watch, the combination of a driven wheel a shipper arm pivotedto the frame of the watch and provided with a bend adjacent to itspivot, a driving wheel adapted for engagement with said driven wheel andconnected with said arm at a Copies of this patent may be obtained forfive cents each, by addressing the Commissioner of Patents.

Washington, D. G.

